Eight'eenth1, a.
(ā'teenth), a. [A-S. eahtateóðða.]
- Next in order after the seventeenth.
- Consisting of one of eighteen equal parts into which any thing is divided.
2 entries under this word
Eighteenth
Eight'eenth2, n.
n. 1. The quotient of a unit divided by eighteen; one of eighteen equal parts.
Sense 2. The eighth after the tenth.
Sense 3. (Mus.) An interval comprising two octaves and a fourth. Moore.